CN114731729B

CN114731729B - Cooperative transmission method, equipment and system

Info

Publication number: CN114731729B
Application number: CN201980102380.0A
Authority: CN
Inventors: 马驰翔; 张鹏; 刘荣宽; 许华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2024-03-26
Anticipated expiration: 2039-12-12
Also published as: WO2021114191A1; CN114731729A

Abstract

The embodiment of the application provides a cooperative transmission method, equipment and a system, which can reduce transmission delay. In the scheme, the cooperative terminal equipment receives a first data packet from the network equipment, then determines that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment, and sends first indication information to the network equipment, wherein the first indication information is used for indicating that the cooperative terminal equipment cannot be used as the relay node.

Description

Cooperative transmission method, equipment and system

Technical Field

The present disclosure relates to the field of communications, and in particular, to a method, an apparatus, and a system for cooperative transmission.

Background

In one scenario of user cooperative transmission, a base station may send data sent to a target user equipment (target user equipment, TUE) to the TUE and a cooperative user equipment (cooperation user equipment, CUE) serving the TUE simultaneously in a multicast manner, and then the CUE forwards data received from the base station to the TUE through a side uplink, and the TUE performs joint decoding using the data received from the base station and the CUE to obtain data sent by the base station to the TUE. Alternatively, in another scenario of user cooperative transmission, the base station sends data sent to the TUE to the CUE serving the TUE, after which the CUE forwards data received from the base station to the TUE via a side-link, and the TUE decodes the data received from the CUE to obtain data sent to the TUE by the base station.

When the CUE forwards data to the TUE through the side uplink, if the number of bits which can be transmitted on the side uplink is smaller than the number of bits of the data which needs to be forwarded due to insufficient bandwidth resources of the side uplink, the CUE divides the larger data packet which needs to be forwarded into a plurality of smaller data packets, and performs multiple transmissions on the side uplink so as to forward the plurality of smaller data packets to the TUE; or if the channel quality between the CUE and the TUE is poor, the CUE retransmits the data to be forwarded for a plurality of times so as to complete forwarding.

However, the transmission delay caused by multiple transmissions is relatively large, and the requirement of partial services on low-delay transmission cannot be met. In the prior art, although the base station can reselect the CUE according to the channel quality indication (channel quality indicator, CQI) and the bandwidth of the side link to reduce the time delay in the subsequent transmission process, the scheme uses a long-term statistic value, and cannot cope with the emergency in the side link, and in addition, when the side link is transmitted based on an autonomous mode, the base station cannot learn the CQI and the bandwidth of the side link.

Therefore, how to reduce the transmission delay in the above situation in the transmission based on the user cooperation is a problem to be solved at present.

Disclosure of Invention

The embodiment of the application provides a cooperative transmission method, equipment and a system, which can reduce transmission delay.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

in a first aspect, a cooperative transmission method is provided, where a communication device performing the method may be a cooperative terminal device or may be a module, such as a chip or a chip system, applied in the cooperative terminal device. The following describes an example in which an execution subject is a cooperative terminal device. After the cooperative terminal device receives the first data packet from the network device, it is determined that the cooperative terminal device cannot serve as a relay node to forward the first data packet to the target terminal device, so that the cooperative terminal device sends first indication information to the network device, and the first indication information is used for indicating that the cooperative terminal device cannot serve as the relay node.

Based on the scheme, when the cooperative terminal equipment determines that the cooperative terminal equipment cannot serve as the relay node, the first indication information can be sent to the network equipment to inform the network equipment that the cooperative terminal equipment cannot serve as the relay node, and further the network equipment can timely reselect other terminal equipment to serve as the relay node to forward data to the target terminal equipment, so that time delay caused by low-efficiency forwarding of the cooperative terminal equipment is reduced, and flexibility of cooperative transmission is improved.

In one possible design, the determining, by the cooperative terminal device, that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node includes: the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device on a first resource, wherein the first resource is a resource which can be used for the cooperative terminal device to perform side uplink transmission on a first link, and the first link is a side uplink between the cooperative terminal device and the target terminal device.

In one possible design, the cooperative terminal device determining that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource includes: when the bit number of the second data packet to be forwarded by the cooperative terminal device is larger than the first bit number, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, wherein the second data packet comprises part or all of bits of the first data packet, and the first bit number is the bit number allowed to be transmitted on the first resource.

In one possible design, the cooperative terminal device determining that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource includes: when the first time difference is larger than the time delay requirement of the service corresponding to the first data packet, the cooperative terminal equipment determines that the cooperative terminal equipment cannot forward the first data packet to the target terminal equipment on the first resource, and the first time difference is the time difference between the current time and the starting time of the first resource.

Based on the scheme, because the time difference between the starting time and the current time of the available first resource is larger than the time delay requirement of the service corresponding to the first data packet, when the first resource is used for transmitting the first data packet, the time delay is inevitably larger, so that the time delay requirement of the service corresponding to the first data packet cannot be met, at the moment, the cooperative terminal equipment determines that the first data packet cannot be forwarded to the target terminal equipment on the first resource, and further sends the first indication information to the network equipment, so that the network equipment can schedule other terminal equipment as a relay node, and the data transmission time delay of the service is reduced.

In one possible design, the determining, by the cooperative terminal device, that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node includes: the cooperative terminal equipment forwards the first data packet to the target terminal equipment; the cooperative terminal equipment receives feedback information aiming at the first data packet from the target terminal equipment; and when the feedback information is negative acknowledgement, the cooperative terminal equipment determines that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment.

In one possible design, when the feedback information is a negative acknowledgement, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node, including: when the feedback information is negative acknowledgement and the bit number of the second data packet to be forwarded by the cooperative terminal device is larger than the first bit number, the cooperative terminal device determines that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device, wherein the second data packet comprises part or all bits of the first data packet, the first bit number is the bit number allowed to be transmitted on a first resource, the first resource is a resource which can be used for the cooperative terminal device to perform side uplink transmission on a first link, and the first link is a side uplink between the cooperative terminal device and the target terminal device.

In one possible design, when the feedback information is a negative acknowledgement, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node, including: when the feedback information is negative acknowledgement and the first time difference is larger than the time delay requirement of the service corresponding to the first data packet, the cooperative terminal equipment determines that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment, wherein the first time difference is the time difference between the current time and the starting time of first resources, the first resources are resources which can be used for the cooperative terminal equipment to perform side-link transmission on a first link, and the first link is a side-link between the cooperative terminal equipment and the target terminal equipment.

Based on the scheme, after the cooperative terminal equipment receives the negative response to the first data packet, whether the first data packet can be retransmitted is further determined, when the first data packet cannot be retransmitted is determined, the first data packet cannot be forwarded to the target terminal equipment as the relay node is determined, and the accuracy of judging whether the first data packet can be used as the relay node by the cooperative terminal equipment can be improved.

In one possible design, the cooperative transmission method further includes: and the cooperative terminal equipment determines a first bit number according to the size of the first resource and the quality value of the current moment of the first channel, wherein the first channel is used when the cooperative terminal equipment performs side-link transmission on the first link.

In one possible design, when the number of data streams transmitted on the first channel is equal to 1, the size of the first resource and the quality value of the current time of the first channel satisfy the following first formula:

S*lg(1+SINR)；

wherein S is the size of the first resource, and SINR is the quality value of the first channel at the current time.

In one possible design, when the number of data streams transmitted on the first channel is greater than 1, the size of the first resource and the quality value of the current time of the first channel satisfy the following second formula:

wherein S is the size of the first resource, SINR is the quality value of the first channel at the current moment, H is the channel matrix of the first channel, H ^H Let det (X) denote the value of the determinant of X, which is the conjugate transposed matrix of the channel matrix of the first channel.

In one possible design, the cooperative transmission method further includes: the cooperative terminal equipment sends a first time length to the network equipment, wherein the first time length is the time length which takes the current time as a reference and can not be used as a relay node.

In one possible design, the first indication information is a first duration; the first indication information is used for indicating that the cooperative terminal equipment cannot be used as a relay node, and comprises the following steps: the first indication information is used for indicating that the cooperative terminal equipment cannot be used as a relay node in a first time length taking the current time as a reference.

Based on the scheme, the cooperative terminal equipment indicates the first time length to the network equipment, so that the network equipment can continuously schedule the cooperative terminal equipment to serve as a relay node after the first time length, the cooperative terminal equipment can continuously serve the target terminal equipment, and the flexibility of the cooperative terminal equipment in participating in cooperative transmission is further improved.

In one possible design, the cooperative transmission method further includes: the cooperative terminal equipment determines that the cooperative terminal equipment can serve as a relay node to forward the data packet to the target terminal equipment, and sends second indication information to the network equipment, wherein the second indication information is used for indicating that the cooperative terminal equipment can serve as the relay node.

Based on the scheme, after the cooperative terminal equipment determines that the cooperative terminal equipment can serve as the relay node, the second indication information is sent to the network equipment, so that the network equipment can continuously schedule the cooperative terminal equipment to serve as the relay node, the cooperative terminal equipment can continuously provide forwarding service for the target terminal equipment, and the flexibility of the cooperative terminal equipment in participating in cooperative transmission is improved.

In one possible design, the cooperative terminal device determines that the cooperative terminal device can forward the data packet to the target terminal device as a relay node, including: when the bit number of the second data packet to be forwarded by the cooperative terminal device is smaller than or equal to the second bit number, the cooperative terminal device determines that the cooperative terminal device can be used as a relay node to forward the data packet to the target terminal device, wherein the second data packet comprises part or all of bits of the first data packet, and the second bit number is the bit number allowed to be transmitted on the second resource.

In one possible design, the cooperative terminal device determines that the cooperative terminal device can forward the data packet to the target terminal device as a relay node, including: when the second time difference is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, the cooperative terminal equipment determines that the cooperative terminal equipment can serve as a relay node to forward the data packet to the target terminal equipment, and the second time difference is the time difference between the current time and the starting time of the second resource.

Based on the scheme, because the time difference between the starting time and the current time of the available second resource is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, when other data packets of the service are transmitted by using the second resource, the time delay requirement of the service may be met, at this time, the cooperative terminal device determines that the data packets can be forwarded to the target terminal device as a relay node, and further sends second indication information to the network device, so that the network device can continuously schedule the cooperative terminal device as the relay node, thereby the cooperative terminal device can continuously provide forwarding service to the target terminal device, and the flexibility of the cooperative terminal device in participating in the cooperative transmission is improved.

In a second aspect, a communication device is provided for implementing the various methods described above. The communication means may be the cooperative terminal device in the first aspect, or an apparatus including the cooperative terminal device. The communication device comprises corresponding modules, units or means (means) for realizing the method, and the modules, units or means can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.

In a third aspect, there is provided a communication apparatus comprising: a processor and a memory; the memory is configured to store computer instructions that, when executed by the processor, cause the communication device to perform the method of any of the above aspects. The communication means may be the cooperative terminal device in the first aspect, or an apparatus including the cooperative terminal device.

In a fourth aspect, there is provided a communication apparatus comprising: a processor; the processor is configured to couple to the memory and to execute the method according to any of the above aspects in accordance with the instructions in the memory after reading the instructions. The communication means may be the cooperative terminal device in the first aspect, or an apparatus including the cooperative terminal device.

In a fifth aspect, there is provided a computer readable storage medium having instructions stored therein which, when run on a computer, cause the computer to perform the method of any of the above aspects.

In a sixth aspect, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of any of the above aspects.

In a seventh aspect, there is provided a communications device (e.g. which may be a chip or a system of chips) comprising a processor for carrying out the functions of any of the aspects described above. In one possible design, the communication device further includes a memory for holding necessary program instructions and data. When the communication device is a chip system, the communication device may be formed of a chip, or may include a chip and other discrete devices.

An eighth aspect provides a communication apparatus comprising: a processor and interface circuitry, which may be code/data read-write interface circuitry, for receiving computer-executable instructions (the computer-executable instructions being stored in memory, possibly read directly from the memory, or possibly via other devices) and transmitting them to the processor; the processor is configured to execute the computer-executable instructions to perform the method of any of the above aspects. The communication means may be the cooperative terminal device in the first aspect, or an apparatus including the cooperative terminal device.

The technical effects of any one of the second to eighth aspects may be referred to the technical effects of the different designs in the first aspect, which are not described herein.

A ninth aspect provides a communication system comprising the cooperative terminal device and the network device of the first aspect.

Drawings

FIG. 1a is a schematic view of a user collaboration scenario in the prior art;

FIG. 1b is a schematic diagram of another conventional user collaboration scenario;

fig. 2 is a schematic structural diagram of a communication system according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a terminal device and a network device provided in an embodiment of the present application;

fig. 4 is another schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 5 is a schematic flow chart of a cooperative transmission method provided in an embodiment of the present application;

fig. 6 is a second flowchart of a cooperative transmission method provided in the embodiment of the present application;

fig. 7 is a flowchart of a cooperative transmission method according to an embodiment of the present application;

fig. 8 is a flow chart diagram of a cooperative transmission method provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

For the convenience of understanding the technical solutions of the embodiments of the present application, a brief description of related technologies or terms of the present application is given below.

First, user collaboration:

user cooperation is one of the main supported features of the next-generation communication system, i.e., the New Radio (NR) communication system, and can significantly improve the capacity of the system and the coverage area of the network, while reducing the load on the base station side. Wherein, the prior art proposes a variety of user collaboration scenarios:

in a typical user collaboration scenario, user collaboration based transmission mainly includes two phases: the first stage base station sends data to the TUE and one or more CUEs related to the TUE in a multicast mode; in the second stage, the one or more CUEs forward the correctly received data to the TUE through a Sidelink (SL), where the CUE may forward the data to the TUE through the SL in a plurality of forwarding modes, such as amplification forwarding, decoding forwarding, compression forwarding, and the like; the first phase transmission may be considered a transmission on the access link and the second phase transmission may be considered a transmission on the cooperative link. The TUE may jointly decode the data transmitted by the base station received in the first stage and the data forwarded by the one or more CUEs received in the second stage, thereby improving the reception performance of the TUE.

Illustratively, as shown in fig. 1a, TUE-related CUEs are CUE1 and CUE2, and in a first stage, the base station transmits data to TUEs, CUE1 and CUE2; in the second stage, CUE1 and CUE2 forward correctly received data to TUE.

In another typical user cooperation scenario, the TUE does not receive data sent by the base station in the first phase, for example, due to the TUE being out of coverage of the base station or the channel quality between the base station and the TUE being too poor, and in the second phase, the TUE forwards data correctly received from the base station to the TUE, i.e. the TUE only receives data forwarded by the TUE in the second phase.

Illustratively, as shown in fig. 1b, in the first phase, the TUE does not receive data sent by the base station, and in the second phase, the data forwarded by CUE1 and CUE2 is received.

Wherein in user collaboration based transmission the TUE and the one or more CUEs serving the TUE form a user collaboration group, e.g. TUE, CUE1 and CUE2 in fig. 1a or 1b form a user collaboration group. For the UE, it may make TUEs in the user cooperation group centered on itself, and may also be CUEs in other one or more user cooperation groups, where multiple different user cooperation groups may exist in the same cell.

Further, in the user cooperation based transmission, when there are a plurality of UEs around the TUE that can be CUEs of the TUE, the network side or the TUE may select one or more of the plurality of UEs as CUEs of the TUE.

Second, side-uplink transmission mode:

there are two transmission modes on the side-link, mode1 (mode 1) and mode2 (mode 2), respectively.

Where mode1 refers to a side-link transmission by a network device allocating resources to a terminal device, or mode1 refers to a side-link transmission by a network device scheduling, mode1 may also be referred to as a scheduling mode. Under mode1, when the terminal device transmits data on the sidelink, a buffer status report (buffer status report, BSR) on the sidelink needs to be reported to the network device over uplink resources to request the network device to schedule the sidelink resources for it. When no available uplink resource is used for the terminal device to report the BSR, the terminal device triggers a scheduling request (scheduling request, SR) to request to report the uplink resource of the BSR, and at this time, the triggered scheduling request is in a suspended state.

Where mode2 refers to autonomous side-link transmission between terminal devices without scheduling or allocating resources by the network devices, mode2 may also be referred to as autonomous mode. Under mode2, the terminal device autonomously selects an appropriate side uplink resource to transmit data through a sensing (sending) resource. The sensing mechanism mainly comprises two aspects of decoding scheduling allocation (sch eduling assignment, SA) and energy measurement, the terminal equipment can acquire time-frequency resources reserved by other terminal equipment and side uplink data packet priority (PPPP) which needs to be sent on the time-frequency resources by decoding the SA of the other terminal equipment in a sliding sensing window, and then select the side uplink resources to transmit data in resources which are not reserved by the other terminal equipment or have lower priority of the data packets to be transmitted by energy measurement.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Wherein, in the description of the present application, "/" means that the related objects are in a "or" relationship, unless otherwise specified, for example, a/B may mean a or B; the term "and/or" in this application is merely an association relation describing an association object, and means that three kinds of relations may exist, for example, a and/or B may mean: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. Also, in the description of the present application, unless otherwise indicated, "a plurality" means two or more than two. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", and the like are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

As shown in fig. 2, a communication system 10 is provided in an embodiment of the present application, where the communication system 10 includes a network device 20 and one or more terminal devices 30 connected to the network device 20, and different terminal devices 30 may communicate with each other. Any one of the terminal devices 30 may be used as a cooperative terminal device or a target terminal device, which is not specifically limited in the embodiment of the present application.

Taking the interaction between the network device 20 and any terminal device 30 as a cooperative terminal device as shown in fig. 2 as an example, in this embodiment of the present application, the cooperative terminal device receives a first data packet from the network device 20, where the cooperative terminal device determines that the first data packet cannot be forwarded to the target terminal device as a relay node, and sends first indication information to the network device 20, where the first indication information is used to indicate that the cooperative terminal device cannot be used as a relay node.

In the embodiment of the present invention, when the cooperative terminal device determines that the cooperative terminal device cannot be used as a relay node, the first indication information may be sent to the network device to notify the network device that the cooperative terminal device cannot be used as the relay node, so that the network device may reselect other terminal devices as relay nodes in time to forward data to the target terminal device, thereby reducing the delay caused by the inefficient forwarding of the cooperative terminal device.

Optionally, the network device 20 in the embodiment of the present application is a device that accesses the terminal device 30 to a wireless network. The network device 20 may be a node in a radio access network, also referred to as a base station, and also referred to as a radio access network (radio access network, RAN) node (or device). For example, the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (long term evolution, LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), such as a conventional macro base station eNB and a micro base station eNB in a heterogeneous network scenario, or may also include a next generation Node B (next generation Node B, gNB) in an NR system, or may also include a transmission receiving point (transmission reception point, TRP), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a baseband unit (BBU), a baseband pool, or a WiFi Access Point (AP), or the like, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud radio access network, cloudRAN) system, which embodiments of the present application are not limited.

Alternatively, the terminal device 30 in the embodiment of the present application may be a device for implementing a wireless communication function, such as a terminal, or a chip that may be used in a terminal, or a vehicle (vehicle), or a vehicle-mounted terminal that is mounted on a vehicle for assisting the vehicle in running, or a chip within a vehicle-mounted terminal. The terminal may be a UE, an access terminal, a terminal unit, a terminal station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a terminal agent, a terminal apparatus, or the like in a 5G network or a future evolved PLMN. An access terminal may be a cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capability, computing device or other processing device connected to a wireless modem, vehicle-mounted device or wearable device, virtual Reality (VR) terminal device, augmented reality (augmented reality, AR) terminal device, wireless terminal in industrial control (industrial control), wireless terminal in self-driving (self-driving), wireless terminal in telemedicine (remote medium), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), etc. The terminal may be mobile or stationary.

Alternatively, the network device 20 and the terminal device 30 in the embodiments of the present application may also be referred to as a communication device, which may be a general-purpose device or a special-purpose device, which is not specifically limited in the embodiments of the present application.

Optionally, as shown in fig. 3, a schematic structural diagram of the network device 20 and the terminal device 30 provided in the embodiments of the present application is shown.

Wherein the terminal device 30 comprises at least one processor (illustrated in fig. 3 by way of example as comprising one processor 301) and at least one transceiver (illustrated in fig. 3 by way of example as comprising one transceiver 303). Optionally, the terminal device 30 may further include at least one memory (illustrated in fig. 3 by way of example as including one memory 302), at least one output device (illustrated in fig. 3 by way of example as including one output device 304), and at least one input device (illustrated in fig. 3 by way of example as including one input device 305).

The processor 301, the memory 302 and the transceiver 303 are connected by a communication line. The communication line may include a pathway to communicate information between the aforementioned components.

The processor 301 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application Specific Integrated Circuit (ASIC), or one or more integrated circuits for controlling the execution of programs in accordance with aspects of the present application. In a specific implementation, the processor 301 may also include multiple CPUs, as an embodiment, and the processor 301 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

The memory 302 may be a device having a memory function. For example, but not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 302 may be stand alone and be connected to the processor 301 by a communication line. Memory 302 may also be integrated with processor 301.

The memory 302 is used for storing computer-executable instructions for executing the embodiments of the present application, and is controlled by the processor 301 to execute the instructions. Specifically, the processor 301 is configured to execute computer-executable instructions stored in the memory 302, thereby implementing the cooperative transmission method described in the embodiments of the present application. Alternatively, the computer-executable instructions in the embodiments of the present application may be referred to as application program code or computer program code, which is not specifically limited in the embodiments of the present application.

The transceiver 303 may use any transceiver-like device for communicating with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), or wireless local area network (wireless local area networks, WLAN), etc. The transceiver 303 includes a transmitter (Tx) and a receiver (Rx).

The output device 304 communicates with the processor 301 and may display information in a variety of ways. For example, the output device 304 may be a liquid crystal display (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), or the like.

The input device 305 communicates with the processor 301 and may accept user input in a variety of ways. For example, the input device 305 may be a mouse, a keyboard, a touch screen device, a sensing device, or the like.

The network device 20 includes at least one processor (illustrated in fig. 3 by way of example as including one processor 201), at least one transceiver (illustrated in fig. 3 by way of example as including one transceiver 203), and at least one network interface (illustrated in fig. 3 by way of example as including one network interface 204). Optionally, the network device 20 may also include at least one memory (illustrated in fig. 3 by way of example as including one memory 202). Wherein the processor 201, the memory 202, the transceiver 203 and the network interface 204 are connected by communication lines. The network interface 204 is used to connect with a core network device through a link (e.g., S1 interface) or connect with a network interface of another network device (not shown in fig. 3) through a wired or wireless link (e.g., X2 interface), which is not specifically limited in this embodiment of the present application. In addition, the description of the processor 201, the memory 202 and the transceiver 203 may refer to the description of the processor 301, the memory 302 and the transceiver 303 in the terminal device 30, which are not repeated herein.

In connection with the schematic structural diagram of the terminal device 30 shown in fig. 3, fig. 4 is an exemplary specific structural form of the terminal device 30 according to the embodiment of the present application.

Wherein in some embodiments the functionality of processor 301 in fig. 3 may be implemented by processor 110 in fig. 4.

In some embodiments, the functionality of transceiver 303 in fig. 3 may be implemented by antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, etc. in fig. 4.

Wherein the antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the terminal device 30 may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution for wireless communication including 2G/3G/4G/5G or the like applied on the terminal device 30. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The mobile communication module 150 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 150 can amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be provided in the same device as at least some of the modules of the processor 110.

The wireless communication module 160 may provide solutions for wireless communication including wireless local area network (wireless local area networks, WLAN) (e.g., wi-Fi network), bluetooth (BT), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field wireless communication (near field communication, NFC), infrared technology (IR), etc. applied on the terminal device 30. The wireless communication module 160 may be one or more devices that integrate at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, frequency modulate it, amplify it, and convert it to electromagnetic waves for radiation via the antenna 2. When the terminal device 30 is a first device, the wireless communication module 160 may provide a solution for NFC wireless communication applied on the terminal device 30, meaning that the first device comprises an NFC chip. The NFC chip can improve NFC wireless communication functions. When the terminal device 30 is a second device, the wireless communication module 160 may provide a solution for NFC wireless communication applied on the terminal device 30, meaning that the first device comprises an electronic tag (e.g. radio frequency identification (radio frequency identification, RFID) tag). The NFC chips of other devices are close to the electronic tag and can conduct NFC wireless communication with the second device.

In some embodiments, antenna 1 and mobile communication module 150 of terminal device 30 are coupled, and antenna 2 and wireless communication module 160 are coupled, such that terminal device 30 may communicate with a network and other devices via wireless communication techniques. The wireless communication techniques may include the Global System for Mobile communications (global system for mobile communications, GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC, FM, or IR techniques, among others. The GNSS may include a global satellite positioning system (global positioning system, GPS), a global navigation satellite system (global navigation satellite system, GLONASS), a beidou satellite navigation system (beidou navigation satellite system, BDS), a quasi zenith satellite system (quasi-zenith satellite system, QZSS) or a satellite based augmentation system (satellite based augmentation systems, SBAS).

In some embodiments, the functionality of memory 302 in FIG. 3 may be implemented by internal memory 121 in FIG. 4, or an external memory (e.g., a Micro SD card) to which external memory interface 120 is connected, or the like.

In some embodiments, the functionality of the output device 304 in FIG. 3 may be implemented by the display 194 in FIG. 4. Wherein the display screen 194 is used to display images, videos, etc. The display 194 includes a display panel.

In some embodiments, the functionality of the input device 305 in FIG. 3 may be implemented by a mouse, a keyboard, a touch screen device, or the sensor module 180 in FIG. 4. By way of example, as shown in fig. 4, the sensor module 180 may include, for example, one or more of a pressure sensor 180A, a gyroscope sensor 180B, a barometric pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, and a bone conduction sensor 180M, which is not specifically limited in this embodiment.

In some embodiments, as shown in fig. 4, the terminal device 30 may further include one or more of an audio module 170, a camera 193, an indicator 192, a motor 191, a key 190, a SIM card interface 195, a USB interface 130, a charging management module 130, a power management module 141, and a battery 142, where the audio module 170 may be connected to a speaker 170A (also referred to as a "speaker"), a receiver 170B (also referred to as an "earpiece"), a microphone 170C (also referred to as a "microphone," "microphone"), or an earphone interface 170D, etc., which embodiments of the present application are not particularly limited.

It is to be understood that the structure shown in fig. 4 does not constitute a specific limitation on the terminal device 30. For example, in other embodiments of the present application, terminal device 30 may include more or fewer components than shown, or certain components may be combined, certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The cooperative transmission method provided in the embodiment of the present application will be described below with reference to fig. 1a to 4 by taking the interaction among the network device 20, the terminal device 30 as a cooperative terminal device, and the terminal device 30 as a target terminal device shown in fig. 2 as an example.

It should be noted that, in the embodiments described below, the names of the messages between the network elements or the names of the parameters in the messages are only an example, and may be other names in specific implementations, which are not limited in the embodiments of the present application.

As shown in fig. 5, the method for cooperative transmission according to the embodiment of the present application includes the following steps:

s501, the network device sends a first data packet to the cooperative terminal device. Correspondingly, the cooperative terminal device receives a first data packet from the network device.

S502, the cooperative terminal equipment determines that the cooperative terminal equipment cannot serve as a relay node to forward the first data packet to the target terminal equipment.

Optionally, the reason why the cooperative terminal device cannot serve as the relay node may be that the available side uplink resource is insufficient, and the cooperative terminal device cannot map all bits of the first data packet to the resource for transmission; or, the quality of the channel between the cooperative terminal device and the target terminal device is poor, and the target terminal device cannot correctly receive the first data packet forwarded by the cooperative terminal device; alternatively, other reasons are possible, and embodiments of the present application are not particularly limited thereto.

It can be appreciated that, due to poor channel quality or insufficient available side uplink resources, the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device, so that for a period of time, the cooperative terminal device may not be able to forward the new data packet to be forwarded, which is received from the network device, to the target terminal device, and if the cooperative terminal device receives the data packet to be forwarded from the network device, the data packet to be forwarded cannot be successfully forwarded, which may cause overflow of a buffer of the cooperative terminal device, and further result in data loss. Therefore, the cooperative terminal equipment determines that the cooperative terminal equipment cannot serve as a relay node to forward the first data packet to the target terminal equipment, and can also be understood as that the cooperative terminal equipment determines that the cooperative terminal equipment cannot continuously receive the data packet sent to the target terminal equipment, or cannot continuously receive the new data packet needing to be forwarded.

S503, the cooperative terminal device sends first indication information to the network device. Correspondingly, the network device receives the first indication information from the cooperative terminal device.

The first indication information is used for indicating that the cooperative terminal equipment cannot serve as a relay node. It can be understood that the cooperative terminal device cannot be understood as a relay node as follows: the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device, or the cooperative terminal device cannot be used as a relay node to continuously receive the data packet sent to the target terminal device, or cannot be used as a relay node to continuously receive a new data packet needing to be forwarded.

Alternatively, the first indication information may also be referred to as a stop relay indication (disable relay indicator), and the first indication information and the stop relay indication may be replaced with each other, which is not specifically limited in the embodiment of the present application.

Alternatively, the first indication information may be represented by 1 bit, where the value of the 1 bit is "0", and indicates that the cooperative terminal device cannot be used as a relay node, or where the value of the 1 bit is "1", and indicates that the cooperative terminal device cannot be used as a relay node.

Optionally, when the cooperative terminal device sends the first indication information to the network device, the first indication information may be carried in an existing message (or frame), for example, the first indication information may be carried in a BSR message; or, the cooperative terminal device may also carry the first indication information in a newly defined message, which is not specifically limited in the embodiment of the present application.

Optionally, after receiving the first indication information, the network device may reselect other terminal devices as a new relay node between the network device and the target terminal device, so that the new relay node forwards the first data packet or other data packets sent to the target terminal device.

Based on the scheme, when the cooperative terminal equipment determines that the cooperative terminal equipment cannot serve as the relay node, the first indication information can be sent to the network equipment to inform the network equipment that the cooperative terminal equipment cannot serve as the relay node, so that the network equipment can timely reselect other terminal equipment to serve as the relay node to forward data to the target terminal equipment, time delay caused by inefficient forwarding of the cooperative terminal equipment is reduced, and flexibility of cooperative transmission is improved.

Optionally, in an implementation scenario of the embodiment of the present application, as shown in fig. 6, the cooperative transmission method provided in the embodiment of the present application further includes step S504:

s504, the cooperative terminal equipment determines a first time length.

The first duration is a duration of time when the cooperative terminal equipment cannot serve as a relay node by taking the current time as a reference.

Optionally, the cooperative terminal device may determine the first time length according to the number of bits of the data packet to be forwarded to the target terminal device, where the data packet to be forwarded to the target terminal device may be part or all of the data packets in a first buffer of the cooperative terminal device, the first buffer is a buffer corresponding to a first link, and the first link is a side uplink between the cooperative terminal device and the target terminal device.

The first duration may be, for example, a ratio of a number of bits of a data packet to be forwarded to the target terminal device to a first transmission rate, where the first transmission rate may be a transmission rate to be used by the cooperative terminal device when performing side-link transmission on the first link in a period based on a current time, or the first transmission rate may also be a transmission rate to be used by the cooperative terminal device when performing side-link transmission on the first link in a period before the current time.

In a possible implementation manner, the step S504 may be performed before the step S503, where the first indication information may be indicated by the first time length, that is, the first indication information is a first time length, and accordingly, the first indication information indicates that the cooperative terminal device cannot be used as a relay node, and may include: the first indication information is used for indicating that the cooperative terminal equipment cannot be used as a relay node in a first time length taking the current time as a reference.

Alternatively, in this case, the first indication information may be represented by a designated field in an existing message or a newly defined message, which is not particularly limited in the embodiment of the present application.

In another possible implementation manner, the cooperative transmission method provided in the embodiment of the present application further includes step S505:

s505, the cooperative terminal equipment sends a first duration to the network equipment. Corresponding to the above. The network device receives a first duration from the collaboration terminal device.

That is, the cooperative terminal device may send the first duration to the network device in addition to the first indication information to the network device.

Optionally, the cooperative terminal device may send the first indication information and the first time length in one message, or may send the first indication information and the first time length in different messages, which is not specifically limited in the embodiment of the present application.

It may be understood that the first duration may be understood as a duration of insufficient resources or poor channel quality estimated by the cooperative terminal device, after the duration has elapsed, the channel quality may be improved or available side uplink resources may be sufficient, at this time, the cooperative terminal device may be able to continue to function as a relay node, so, when the first indication information is the first duration or the cooperative terminal device further sends the first duration to the network device, after the first duration from the current time, the network device may continue to schedule the cooperative terminal device as a relay node, so that the cooperative terminal device may continue to forward the data packet to the target terminal device, where the current time may be a time when the network device receives the first duration.

Based on the scheme, the first duration is indicated to the network equipment by the cooperative terminal equipment, so that the network equipment can continuously schedule the cooperative terminal equipment to serve as a relay node after the first duration from the current moment, the cooperative terminal equipment can continuously serve the target terminal equipment, and the flexibility of the cooperative terminal equipment in participating in cooperative transmission is further improved.

Optionally, in another implementation scenario of the embodiment of the present application, as shown in fig. 7, the cooperative transmission method provided in the embodiment of the present application further includes steps S506 to S507:

s506, the cooperative terminal equipment determines that the cooperative terminal equipment can serve as a relay node to forward the data packet to the target terminal equipment.

Optionally, after sending the first indication information to the network device, the cooperative terminal device may periodically determine whether the cooperative terminal device can continue to forward the data packet to the target terminal device as the relay node, and execute step S507 described below when the cooperative terminal device determines that the cooperative terminal device can forward the data packet to the target terminal device as the relay node.

It may be appreciated that when the cooperative terminal device estimates that the channel quality of the cooperative terminal device and the target terminal device is improved or that the available side uplink resources may be sufficient, the cooperative terminal device may determine that the cooperative terminal device can forward the data packet to the target terminal device as a relay node, and further perform step S507 described below.

Optionally, the cooperative terminal device may continue to forward the data packet to the target terminal device as a relay node, which may be understood that the cooperative terminal device may continue to receive the data packet sent to the target terminal device, or may continue to receive a new data packet to be forwarded.

S507, the cooperative terminal device sends second indication information to the network device. Correspondingly, the network device receives the second indication information from the cooperative terminal device.

The second indication information is used for indicating that the cooperative terminal equipment can serve as a relay node. It can be understood that the cooperative terminal device can be regarded as a relay node as follows: the cooperative terminal device can be used as a relay node to forward the data packet to the target terminal device, or the cooperative terminal device can be used as a relay node to receive the data packet sent to the target terminal device, or can continue to be used as a relay node to receive a new data packet needing to be forwarded.

Alternatively, the second indication information may also be referred to as an enable relay indication (enable relay indicator), which may be replaced with another, which is not specifically limited in the embodiments of the present application.

Alternatively, the second indication information may be represented by 1 bit, where the value of the 1 bit is "1", and indicates that the cooperative terminal device can serve as a relay node, or where the value of the 1 bit is "0", and indicates that the cooperative terminal device can serve as a relay node.

Optionally, when the cooperative terminal device sends the second indication information to the network device, the second indication information may be carried in an existing message (or frame), for example, the second indication information may be carried in a BSR message; or, the cooperative terminal device may carry the second indication information in a newly defined message, which is not specifically limited in the embodiment of the present application.

Optionally, after receiving the second indication information, the network device may continue to schedule the cooperative terminal device as a relay node, so that the cooperative terminal device may continue to forward the data packet to the target terminal device.

In addition, based on the dynamic cooperative transmission method as shown in fig. 5, fig. 6 or fig. 7, the embodiment of the present application further provides a method in which the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node in the above step S502.

Optionally, in different implementation scenarios of the embodiments of the present application, a method for determining, by a cooperative terminal device, that the cooperative terminal device cannot forward, as a relay node, a first data packet to a target terminal device may also be different.

In an implementation scenario of the embodiment of the present application, the determining, by the cooperative terminal device, that the cooperative terminal device cannot forward, as the relay node, the first data to the target terminal device may include: the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource.

The first resource is a resource which can be used for the cooperative terminal equipment to perform side-link transmission on a first link, and the first link is a side-link between the cooperative terminal equipment and the target terminal equipment.

Optionally, the first resource may be a side uplink resource scheduled to the cooperative terminal device by the network device under mode1, or may be a side uplink resource autonomously heard by the cooperative terminal device under mode 2; the first resource may be continuous or discontinuous in the time domain, or the first resource may be continuous or discontinuous in the frequency domain, which is not specifically limited in the embodiment of the present application.

Optionally, for the cooperative terminal device, the duration of the time domain portion of the first resource may be known or determined, and accordingly, in mode1, the side uplink resource scheduled by the network device for the cooperative terminal device is the frequency domain portion of the first resource; under mode2, the side uplink resource autonomously heard by the cooperative terminal device is a frequency domain portion of the first resource. Alternatively, the bandwidth of the frequency domain portion of the first resource may be known or determined, and accordingly, the side uplink resource scheduled by the network device for the cooperative terminal device under mode1 is the time domain portion of the first resource; under mode2, the side-link resource autonomously heard by the cooperative terminal device is a time domain portion of the first resource. Or, the duration of the time domain part of the first resource and the bandwidth of the frequency domain part of the first resource may be unknown, and correspondingly, in mode1, the side uplink resource scheduled by the network device for the cooperative terminal device includes the bandwidth of the frequency domain part of the first resource and the duration of the time domain part of the first resource; under mode2, the autonomously heard side-link resources by the cooperative terminal device include a bandwidth of a frequency domain portion of the first resource and a duration of a time domain portion of the first resource.

The unit of the duration may be a symbol or a time slot or a millisecond, and the unit of the bandwidth may be a subcarrier or a subchannel or a Hz, which is not specifically limited in the embodiment of the present application.

Optionally, the cooperative terminal device may determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource in two ways:

mode one: when the bit number of the second data packet to be forwarded by the cooperative terminal device is larger than the first bit number, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource.

In this case, the second data packet may be understood as a first data packet to be forwarded after the cooperative terminal device receives the first data packet, where the second data packet includes some or all bits of the first data packet. The first number of bits is the number of bits allowed to be transmitted on the first resource, or the first number of bits is the number of bits that can be transmitted on the first resource.

Optionally, after receiving the first data packet, the cooperative terminal device may determine a first bit number, then compare the bit number of the second data packet with the first bit number, and determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource when the bit number of the second data packet is greater than the first bit number.

Optionally, the cooperative terminal device may determine the first bit number according to a size of the first resource and a quality value of a current time of the first channel. The first channel is a channel used by the cooperative terminal equipment when performing side uplink transmission on the first link, and the current moment can be the moment when the cooperative terminal equipment starts to determine the first bit number; the size of the first resource may be expressed as a product of a duration of the time domain portion and a bandwidth of the frequency domain portion of the first resource.

Optionally, when the number of data streams transmitted on the first channel is equal to 1, the size of the first resource and the quality value of the current time of the first channel satisfy the following first formula:

S*lg(1+SINR)；

or when the number of data streams transmitted on the first channel is greater than 1, the size of the first resource and the quality value of the current time of the first channel satisfy the following second formula:

wherein, in the above-mentioned firstS in a formula and a second formula is the size of a first resource, and SINR is the quality value of the first channel at the current moment; in the second formula, H is the channel matrix of the first channel, H ^H Let det (X) denote the value of the determinant of X, which is the conjugate transposed matrix of the channel matrix of the first channel.

Mode two: when the first time difference is larger than the time delay requirement of the service corresponding to the first data packet, the cooperative terminal equipment determines that the cooperative terminal equipment cannot forward the first data packet to the target terminal equipment on the first resource.

Wherein the first time difference is a time difference between the current time and a starting time of the first resource.

It can be understood that, as shown in the first mode, the cooperative terminal device may determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource according to the size relationship between the number of bits of the second data packet and the first number of bits alone, or determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource according to the size relationship between the first time difference and the time delay requirement of the service corresponding to the first data packet alone, as shown in the second mode; and determining whether the first data packet can be forwarded to the target terminal device on the first resource by combining the size relation between the number of bits of the second data packet and the number of first bits and the size relation between the first time difference and the time delay requirement of the service corresponding to the first data packet, for example, when the number of bits of the second data packet is smaller than or equal to the size of the first number of bits and the first time difference is greater than the time delay requirement of the service corresponding to the first data packet, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, which is not limited in the embodiment of the present application.

In another implementation scenario of the embodiment of the present application, as shown in fig. 8, in the dynamic cooperative transmission method shown in fig. 5, fig. 6, or fig. 7, the determining, by the cooperative terminal device in step S502, that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node may include:

s502a, the cooperative terminal equipment forwards a first data packet to the target terminal equipment. Correspondingly, the target terminal device receives the first data packet from the cooperative terminal device.

S502b, the target terminal equipment sends feedback information aiming at the first data packet to the cooperative terminal equipment. Correspondingly, the cooperative terminal device receives the feedback information from the target terminal device.

S502c, when the feedback information is a negative acknowledgement (negative acknowledgement, NACK), the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device as a relay node.

Optionally, after receiving the feedback information, the cooperative terminal device may determine whether the feedback information is a negative acknowledgement, and when the feedback information is a negative acknowledgement, it is determined that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device.

It can be understood that when the feedback information is negative acknowledgement, it indicates that the target terminal device does not correctly receive the first data packet forwarded by the cooperative terminal device, and at this time, if the cooperative terminal device retransmits the first data packet until the target terminal device correctly receives the first data packet, the delay caused by forwarding is longer, and the delay requirement of the service cannot be met. Based on the method of the embodiment of the application, the cooperative terminal equipment can send the first indication information to the network equipment, so that the network equipment schedules other terminal equipment to serve as a relay node to forward data to the target terminal equipment, and the data transmission delay of the service is reduced.

Optionally, when the feedback information is a negative acknowledgement, the cooperative terminal device may further determine whether the first data packet can be retransmitted:

in one possible implementation manner, the cooperative terminal device may determine a size relationship between the number of bits of the second data packet and the first number of bits, and when the number of bits of the second data packet is greater than the first number of bits, the cooperative terminal device determines that the data packet cannot be retransmitted. In this implementation manner, the second data packet may be understood as a first data packet to be forwarded by the cooperative terminal device after the cooperative terminal device determines that the feedback information is a negative acknowledgement, and the second data packet includes part or all of bits of the first data packet, that is, it may be understood that the cooperative terminal device carries part or all of the bits of the first data packet in the second data packet, so as to retransmit the first data packet, and description of the first bits and a method for determining the first bits may refer to the above related description and are not repeated herein.

That is, in this implementation manner, in the step S502c, when the feedback information is a negative acknowledgement, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node, and may include: when the feedback information is negative acknowledgement and the bit number of the second data packet to be forwarded by the cooperative terminal device is larger than the first bit number, the cooperative terminal device determines that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device.

In another possible implementation manner, the cooperative terminal device may determine a relationship between the first time difference and a time delay requirement of a service corresponding to the first data packet, and when the first time difference is greater than the time delay requirement of the service corresponding to the first data packet, the cooperative terminal device determines that the cooperative terminal device cannot retransmit the data packet. The description and determination method of the first time difference may refer to the above related description, and are not repeated herein.

That is, in this implementation manner, in the step S502c, when the feedback information is a negative acknowledgement, the cooperative terminal device determines that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node, and may include: when the feedback information is negative acknowledgement and the first time difference is larger than the time delay requirement of the service corresponding to the first data packet, the cooperative terminal equipment determines that the cooperative terminal equipment cannot serve as a relay node to forward the first data packet to the target terminal equipment.

Further, based on the dynamic cooperative transmission method shown in fig. 7, the embodiment of the present application further provides a method for determining, by the cooperative terminal device, that the cooperative terminal device can serve as a relay node to forward the data packet to the target terminal device in step S506 shown in fig. 7.

Optionally, the cooperative terminal device may determine that the packet can be forwarded as a relay node to the target terminal device in the following two manners:

in the first mode, when the bit number of the second data packet to be forwarded by the cooperative terminal device is smaller than or equal to the second bit number, the cooperative terminal device determines that the cooperative terminal device can serve as a relay node to forward the data packet to the target terminal device.

In this case, the second data packet may be understood as a first data packet to be forwarded after the cooperative terminal device receives the first data packet, where the second data packet includes some or all bits of the first data packet. That is, the cooperative terminal device estimates that the cooperative terminal device can forward the data packet to the target terminal device as a relay node based on the second data packet in step S502 described above.

The second number of bits is the number of bits allowed to be transmitted on the second resource, where the second resource is a resource that can be used for the cooperative terminal device to perform side-link transmission on the first link, and the second resource may be different from the first resource, for example, the second resource may be a resource rescheduled by the network device for the cooperative terminal device, or may be an available resource that is detected again by the cooperative terminal device, which is not specifically limited in this embodiment of the present application. The method for determining the second number of bits is similar to the method for determining the first number of bits, and the detailed description will refer to the description of the first resource and the first number of bits, which is not repeated here.

It can be understood that, since the cooperative terminal device uses the second data packet in step S502 to estimate that the cooperative terminal device can forward the data packet to the target terminal device as a relay node, and the available resources and the quality of the channel between the cooperative terminal device and the target terminal device may change in the period between the time when the cooperative terminal device performs step S502 and the time when the cooperative terminal device performs step S506, it can be understood that, by using this method, it is determined that the cooperative terminal device can forward the data packet to the target terminal device as a relay node, it is estimated approximately, and whether the data to be forwarded received from the network device later can be forwarded successfully needs to be determined according to the actual situation.

In the second mode, when the second time difference is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, the cooperative terminal equipment determines that the cooperative terminal equipment can serve as a relay node to forward the data packet to the target terminal equipment.

Wherein the second time difference is a time difference between the current time and a starting time of the second resource.

Based on the scheme, because the time difference between the starting time and the current time of the available second resource is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, when other data packets of the service or data packets of other services of the service corresponding to the first data packet are transmitted by using the second resource or the time delay requirement of the second resource is lower than the time delay requirement of the data packets of the other services of the service corresponding to the first data packet, at the moment, the cooperative terminal equipment determines that the data packets can be forwarded to the target terminal equipment as a relay node and then sends second instruction information to the network equipment, so that the network equipment can continuously schedule the cooperative terminal equipment as the relay node, the cooperative terminal equipment can continuously provide forwarding service for the target terminal equipment, and the flexibility of the cooperative terminal equipment participating in the cooperative transmission is improved.

It can be understood that, by determining that the cooperative terminal device can serve as a relay node to forward the data packet to the target terminal device in the second mode, the method can also be understood as approximate estimation, and whether the data to be forwarded can be successfully forwarded or not is determined according to actual situations for the data to be forwarded, which is received from the network device later.

It can be understood that the cooperative terminal device may determine, separately according to the size relationship between the number of bits of the third data packet and the second number of bits, that the data packet can be forwarded as a relay node to the target terminal device, as shown in the first mode, or determine, separately according to the size relationship between the second time difference and the delay requirement of the service corresponding to the first data packet, that the data packet can be forwarded as a relay node to the target terminal device, as shown in the second mode; and determining whether the data packet can be forwarded to the target terminal device as the relay node by combining the size relation between the bit number of the third data packet and the second bit number and the size relation between the second time difference and the time delay requirement of the service corresponding to the first data packet, for example, when the bit number of the third data packet is smaller than or equal to the size of the second bit number and the second time difference is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, the cooperative terminal device determines that the data packet can be forwarded to the target terminal device as the relay node.

It may be understood that, in the embodiments of the present application, the cooperative terminal device may perform some or all of the steps in the embodiments of the present application, these steps or operations are merely examples, and the embodiments of the present application may also perform other operations or variations of various operations. Furthermore, the various steps may be performed in a different order presented in accordance with embodiments of the present application, and it is possible that not all of the operations in the embodiments of the present application may be performed.

In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

It will be appreciated that in the various embodiments above, the methods and/or steps implemented by the cooperating terminal device may also be implemented by a component (e.g., a chip or a system of chips or circuitry) that may be used in the cooperating terminal device.

The above description has been presented mainly from the point of interaction between the network elements. Correspondingly, the embodiment of the application also provides a communication device which is used for realizing the various methods. The communication device may be the cooperative terminal device in the above method embodiment, or a device including the cooperative terminal device, or a component that may be used in the cooperative terminal device. It will be appreciated that the communication device, in order to achieve the above-described functions, comprises corresponding hardware structures and/or software modules performing the respective functions. Those of skill in the art will readily appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the functional modules of the communication device may be divided according to the above embodiment of the method, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

For example, the communication device is taken as an example of the cooperative terminal device in the above method embodiment. Fig. 9 shows a schematic structural diagram of a communication device 90. The communication device 90 comprises a processing module 901 and a transceiver module 902. The transceiver module 902, which may also be referred to as a transceiver unit, is configured to implement a transmitting and/or receiving function, and may be, for example, a transceiver circuit, a transceiver, or a communication interface.

Wherein, the transceiver module 902 is configured to receive a first data packet from a network device; a processing module 901, configured to determine that the cooperative terminal device cannot forward, as a relay node, the first data packet to the target terminal device; the transceiver module 902 is further configured to send first indication information to the network device, where the first indication information is used to indicate that the cooperative terminal device cannot act as a relay node.

Optionally, the processing module 901, configured to determine that the cooperative terminal device cannot forward, as a relay node, the first data packet to the target terminal device may include: a processing module 901, configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on a first resource, where the first resource is a resource that can be used for side uplink transmission of the cooperative terminal device on a first link, and the first link is a side uplink between the cooperative terminal device and the target terminal device.

Optionally, the processing module 901, configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, may include: when the number of bits of the second data packet to be forwarded by the cooperative terminal device is greater than the first number of bits, a processing module 901 is configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on a first resource, where the second data packet includes some or all bits of the first data packet, and the first number of bits is the number of bits allowed to be transmitted on the first resource.

Optionally, the processing module 901, configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, may include: when the first time difference is greater than the time delay requirement of the service corresponding to the first data packet, the processing module 901 is configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, where the first time difference is a time difference between the current time and the starting time of the first resource.

Optionally, the transceiver module 902 is further configured to forward the first data packet to the target terminal device; the transceiver module 902 is further configured to receive feedback information for the first data packet from the target terminal device; the processing module 901, configured to determine that the cooperative terminal device cannot forward, as a relay node, the first data packet to the target terminal device, may include: when the feedback information is a negative acknowledgement, the processing module 901 is configured to determine that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device.

Optionally, when the feedback information is a negative acknowledgement, the processing module 901, configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node, may include: when the feedback information is a negative acknowledgement and the number of bits of the second data packet to be forwarded by the cooperative terminal device is greater than the first number of bits, the processing module 901 is configured to determine that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device.

Optionally, when the feedback information is a negative acknowledgement, the processing module 901, configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device as the relay node, may include: when the feedback information is a negative acknowledgement and the first time difference is greater than the delay requirement of the service corresponding to the first data packet, the processing module 901 is configured to determine that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device.

Optionally, the processing module 901 is further configured to determine the first bit number according to the size of the first resource and a quality value of a current time of a first channel, where the first channel is a channel used by the cooperative terminal device when performing side-link transmission on the first link.

Optionally, the transceiver module 902 is further configured to send a first duration to the network device, where the first duration is a length of time when the cooperative terminal device cannot serve as the relay node with reference to the current time.

Optionally, the processing module 901 is further configured to determine that the cooperative terminal device can serve as a relay node to forward a data packet to the target terminal device; the transceiver module 902 is further configured to send second indication information to the network device, where the second indication information is used to indicate that the cooperative terminal device can act as a relay node.

Optionally, the processing module 901 is further configured to determine that the cooperative terminal device can serve as a relay node to forward a data packet to the target terminal device, where the processing module includes: when the number of bits of the third data packet to be forwarded by the cooperative terminal device is less than or equal to the second number of bits, the processing module 901 is further configured to determine that the cooperative terminal device can be used as a relay node to forward the data packet to the target terminal device, where the second number of bits is the number of bits allowed to be transmitted on the second resource.

Optionally, the processing module 901 is further configured to determine that the cooperative terminal device can serve as a relay node to forward a data packet to the target terminal device, where the processing module includes: when the second time difference is less than or equal to the time delay requirement of the service corresponding to the first data packet, the processing module 901 is further configured to determine that the cooperative terminal device can be used as a relay node to forward the data packet to the target terminal device, where the second time difference is a time difference between the current time and the starting time of the second resource.

All relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.

In the present embodiment, the communication device 90 is presented in a form in which the respective functional modules are divided in an integrated manner. A "module" herein may refer to a particular ASIC, an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that can provide the described functionality. In a simple embodiment, the communication means 90 may take the form of the terminal device 30 shown in fig. 3, as will be appreciated by those skilled in the art.

For example, the processor 301 in the terminal device 30 shown in fig. 3 may cause the terminal device 30 to execute the cooperative transmission method in the above-described method embodiment by calling the computer-executable instructions stored in the memory 302.

Specifically, the functions/implementation procedures of the processing module 901 and the transceiver module 902 in fig. 9 may be implemented by the processor 301 in the terminal device 30 shown in fig. 3 invoking computer-executed instructions stored in the memory 302. Alternatively, the function/implementation procedure of the processing module 901 in fig. 9 may be implemented by the processor 301 in the terminal device 30 shown in fig. 3 invoking a computer-implemented instruction stored in the memory 302, and the function/implementation procedure of the transceiver module 902 in fig. 9 may be implemented by the transceiver 303 in the terminal device 30 shown in fig. 3.

Since the communication device provided in this embodiment may perform the above-mentioned cooperative transmission method, the technical effects that can be obtained by the communication device may refer to the above-mentioned method embodiment, and will not be described herein.

Optionally, embodiments of the present application further provide a communication device (for example, the communication device may be a chip or a chip system), where the communication device includes a processor, and the method is used to implement any of the method embodiments described above. In one possible design, the communication device further includes a memory. The memory for storing the necessary program instructions and data, and the processor may invoke the program code stored in the memory to instruct the communication device to perform the method of any of the method embodiments described above. Of course, the memory may not be in the communication device. In another possible design, the communication device further includes an interface circuit, which is a code/data read/write interface circuit, for receiving computer-executable instructions (the computer-executable instructions being stored in a memory, possibly read directly from the memory, or possibly through other devices) and transmitting to the processor. When the communication device is a chip system, the communication device may be formed by a chip, or may include a chip and other discrete devices, which is not specifically limited in the embodiments of the present application.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like. In an embodiment of the present application, the computer may include the apparatus described above.

Although the present application has been described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the present application. It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of cooperative transmission, the method comprising:

receiving a first data packet from a network device;

determining that the cooperative terminal equipment cannot serve as a relay node to forward the first data packet to the target terminal equipment;

sending first indication information to the network equipment, wherein the first indication information is a first duration, the first indication information is used for indicating that the cooperative terminal equipment cannot be used as a relay node in the first duration taking the current moment as a reference; or,

and sending a first time length to the network equipment, wherein the first time length is the time length which takes the current time as a reference and can not be used as a relay node by the cooperative terminal equipment.

2. The method of claim 1, wherein the determining that the cooperative terminal device cannot forward the first data packet as a relay node to a target terminal device comprises:

determining that the cooperative terminal equipment cannot forward the first data packet to the target terminal equipment on a first resource, wherein the first resource is a resource which can be used for the cooperative terminal equipment to perform side uplink transmission on a first link, and the first link is a side uplink between the cooperative terminal equipment and the target terminal equipment.

3. The method of claim 2, wherein the determining that the cooperating terminal device cannot forward the first data packet to the target terminal device on a first resource comprises:

and when the bit number of the second data packet to be forwarded by the cooperative terminal equipment is larger than a first bit number, determining that the cooperative terminal equipment cannot forward the first data packet to the target terminal equipment on the first resource, wherein the second data packet comprises part or all of bits of the first data packet, and the first bit number is the bit number allowed to be transmitted on the first resource.

4. The method of claim 2, wherein the determining that the cooperating terminal device cannot forward the first data packet to the target terminal device on a first resource comprises:

when the first time difference is larger than the time delay requirement of the service corresponding to the first data packet, determining that the cooperative terminal equipment cannot forward the first data packet to the target terminal equipment on the first resource, wherein the first time difference is the time difference between the current time and the starting time of the first resource.

5. The method of claim 1, wherein the determining that the cooperative terminal device cannot forward the first data packet as a relay node to a target terminal device comprises:

forwarding the first data packet to the target terminal equipment;

receiving feedback information for the first data packet from the target terminal equipment;

and when the feedback information is negative response, determining that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment.

6. The method of claim 5, wherein the determining that the cooperative terminal device cannot forward the first data packet to the target terminal device as a relay node when the feedback information is a negative acknowledgement comprises:

when the feedback information is negative acknowledgement and the bit number of the second data packet to be forwarded by the cooperative terminal device is larger than the first bit number, determining that the cooperative terminal device cannot be used as a relay node to forward the first data packet to the target terminal device, wherein the second data packet comprises part or all of bits of the first data packet, the first bit number is the bit number allowed to be transmitted on a first resource, the first resource is a resource which can be used for the cooperative terminal device to perform side uplink transmission on a first link, and the first link is a side uplink between the cooperative terminal device and the target terminal device.

7. The method of claim 5, wherein the determining that the cooperative terminal device cannot forward the first data packet to the target terminal device as a relay node when the feedback information is a negative acknowledgement comprises:

when the feedback information is negative acknowledgement and the first time difference is larger than the time delay requirement of the service corresponding to the first data packet, determining that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment, wherein the first time difference is the time difference between the current time and the starting time of first resources, the first resources are resources which can be used for the cooperative terminal equipment to perform side-link transmission on a first link, and the first link is a side-link between the cooperative terminal equipment and the target terminal equipment.

8. The method according to claim 3 or 6, characterized in that the method further comprises:

and determining the first bit number according to the size of the first resource and the quality value of the current moment of a first channel, wherein the first channel is used by the cooperative terminal equipment when performing side-link transmission on the first link.

9. The method of claim 8, wherein the size of the first resource and the quality value of the current time of the first channel satisfy the following first formula when the number of data streams transmitted on the first channel is equal to 1:

S*lg(1+SINR)；

s is the size of the first resource, and SINR is the quality value of the first channel at the current moment.

10. The method of claim 8, wherein the size of the first resource and the quality value of the current time of the first channel satisfy the following second formula when the number of data streams transmitted on the first channel is greater than 1:

wherein S is the size of the first resource, SINR is the quality value of the first channel at the current moment, H is the channel matrix of the first channel, H ^H For the conjugate transpose of the channel matrix of the first channel, det (X) represents the value of the determinant of X.

11. The method according to any one of claims 1-10, further comprising:

determining that the cooperative terminal equipment can serve as a relay node to forward a data packet to the target terminal equipment;

and sending second indication information to the network equipment, wherein the second indication information is used for indicating that the cooperative terminal equipment can serve as a relay node.

12. The method according to claim 11, wherein said determining that the cooperating terminal device is capable of forwarding data packets as a relay node to the target terminal device comprises:

and when the bit number of the second data packet to be forwarded by the cooperative terminal equipment is smaller than or equal to the second bit number, determining that the cooperative terminal equipment can be used as a relay node to forward the data packet to the target terminal equipment, wherein the second data packet comprises part or all of bits of the first data packet, and the second bit number is the bit number allowed to be transmitted on a second resource.

13. The method according to claim 11, wherein said determining that the cooperating terminal device is capable of forwarding data packets as a relay node to the target terminal device comprises:

and when the second time difference is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, determining that the cooperative terminal equipment can be used as a relay node to forward the data packet to the target terminal equipment, wherein the second time difference is the time difference between the current time and the starting time of the second resource.

14. A communication device, comprising a transceiver module and a processing module;

The receiving and transmitting module is used for receiving a first data packet from the network equipment;

the processing module is used for determining that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment;

the transceiver module is further configured to send first indication information to the network device, where the first indication information is a first duration, and the first indication information is used to indicate that the cooperative terminal device cannot be used as a relay node in the first duration taking a current time as a reference; or,

the transceiver module is further configured to send a first duration to the network device, where the first duration is a time length by which the cooperative terminal device cannot serve as a relay node with the current time as a reference.

15. The communications apparatus of claim 14, wherein the processing module configured to determine that the cooperating terminal device cannot forward the first data packet as a relay node to a target terminal device comprises:

the processing module is configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on a first resource, where the first resource is a resource that can be used for the cooperative terminal device to perform side-link transmission on a first link, and the first link is a side-link between the cooperative terminal device and the target terminal device.

16. The communications apparatus of claim 15, wherein the means for determining that the cooperating terminal device cannot forward the first data packet to the target terminal device on a first resource comprises:

and when the bit number of the second data packet to be forwarded by the cooperative terminal device is greater than a first bit number, the processing module is configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, where the second data packet includes part or all of bits of the first data packet, and the first bit number is the bit number allowed to be transmitted on the first resource.

17. The communications apparatus of claim 15, wherein the means for determining that the cooperating terminal device cannot forward the first data packet to the target terminal device on a first resource comprises:

when the first time difference is greater than the time delay requirement of the service corresponding to the first data packet, the processing module is configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device on the first resource, where the first time difference is a time difference between a current time and a start time of the first resource.

18. The communication device of claim 14, wherein the communication device is configured to,

the receiving and transmitting module is further configured to forward the first data packet to the target terminal device;

the receiving and transmitting module is further configured to receive feedback information for the first data packet from the target terminal device;

the processing module is configured to determine that the cooperative terminal device cannot forward the first data packet to a target terminal device as a relay node, and includes:

and when the feedback information is negative response, the processing module is used for determining that the cooperative terminal equipment cannot be used as a relay node to forward the first data packet to the target terminal equipment.

19. The communications apparatus of claim 18, wherein when the feedback information is a negative acknowledgement, the processing module configured to determine that the cooperative terminal device cannot forward the first data packet as a relay node to a target terminal device comprises:

when the feedback information is a negative acknowledgement and the bit number of the second data packet to be forwarded by the cooperative terminal device is greater than the first bit number, the processing module is configured to determine that the cooperative terminal device cannot forward the first data packet to the target terminal device as a relay node, where the second data packet includes part or all bits of the first data packet, the first bit number is the number of bits allowed to be transmitted on a first resource, the first resource is a resource that can be used for the cooperative terminal device to perform side link transmission on a first link, and the first link is a side link between the cooperative terminal device and the target terminal device.

20. The communications apparatus of claim 18, wherein when the feedback information is a negative acknowledgement, the processing module configured to determine that the cooperative terminal device cannot forward the first data packet as a relay node to a target terminal device comprises:

when the feedback information is a negative acknowledgement and the first time difference is greater than a time delay requirement of a service corresponding to the first data packet, the processing module is configured to determine that the cooperative terminal device cannot forward the first data packet to a target terminal device as a relay node, where the first time difference is a time difference between a current time and a starting time of a first resource, the first resource is a resource that can be used for the cooperative terminal device to perform side uplink transmission on a first link, and the first link is a side uplink between the cooperative terminal device and the target terminal device.

21. A communication device according to claim 16 or 19, characterized in that,

the processing module is further configured to determine the first number of bits according to a size of the first resource and a quality value of a current time of a first channel, where the first channel is a channel used by the cooperative terminal device when performing side-link transmission on the first link.

22. The communication apparatus of claim 21, wherein the size of the first resource and the quality value of the current time of the first channel satisfy the following first formula when the number of data streams transmitted on the first channel is equal to 1:

S*lg(1+SINR)；

23. The communication apparatus of claim 21, wherein the size of the first resource and the quality value of the current time of the first channel satisfy the following second formula when the number of data streams transmitted on the first channel is greater than 1:

wherein S is the size of the first resource, SINR is the quality value of the first channel at the current moment, H is the channel matrix of the first channel, H ^H Is the firstThe conjugate transpose of the channel matrix of a channel, det (X), represents the value of the determinant of X.

24. A communication device according to any one of claims 14 to 23, wherein,

the processing module is further configured to determine that the cooperative terminal device can serve as a relay node to forward a data packet to the target terminal device;

the transceiver module is further configured to send second indication information to the network device, where the second indication information is used to indicate that the cooperative terminal device can serve as a relay node.

25. The communications apparatus of claim 24, wherein the processing module further configured to determine that the cooperating terminal device is capable of forwarding a data packet to the target terminal device as a relay node comprises:

and when the bit number of the second data packet to be forwarded by the cooperative terminal device is smaller than or equal to the second bit number, the processing module is further configured to determine that the cooperative terminal device can be used as a relay node to forward the data packet to the target terminal device, where the second data packet includes part or all of bits of the first data packet, and the second bit number is the bit number allowed to be transmitted on the second resource.

26. The communications apparatus of claim 24, wherein the processing module further configured to determine that the cooperating terminal device is capable of forwarding a data packet to the target terminal device as a relay node comprises:

and when the second time difference is smaller than or equal to the time delay requirement of the service corresponding to the first data packet, the processing module is further used for determining that the cooperative terminal equipment can serve as a relay node to forward the data packet to the target terminal equipment, and the second time difference is the time difference between the current time and the starting time of the second resource.

27. A communication device, the communication device comprising: a processor;

the processor is configured to read computer-executable instructions in a memory and execute the computer-executable instructions to cause the communication device to perform the method of any of claims 1-13.

28. A communication device, the communication device comprising: a processor and a memory;

the memory is configured to store computer-executable instructions that, when executed by the processor, cause the communication device to perform the method of any of claims 1-13.

29. A communication device, the communication device comprising: a processor and interface circuit;

the interface circuit is used for receiving computer execution instructions and transmitting the computer execution instructions to the processor;

the processor is configured to execute the computer-executable instructions to cause the communication device to perform the method of any one of claims 1-13.

30. A computer readable storage medium comprising instructions which, when executed on a communications device, cause the communications device to perform the method of any of claims 1-13.

31. A communication system comprising the communication apparatus and network device of any of claims 14-26.